三角洲前緣河口壩儲(chǔ)層構(gòu)型界面層次表征

1、三角洲前緣河口壩儲(chǔ)層構(gòu)型界面層次表征2021 年12月 第29卷 第6期石油天然氣學(xué)報(bào)江漢石油學(xué)院學(xué)報(bào)Dec 12021 Vol 129 No 16Journal of Oil and G as T echnology J 1J PI ? 49?三角洲前緣河口壩儲(chǔ)層構(gòu)型界面層次表征李云海,吳勝和,李艷平中國(guó)石油大學(xué)北京資源與信息學(xué)院,北京102249程會(huì)明,辛志國(guó)勝利油田地質(zhì)科學(xué)研究院,山東東營(yíng)257015趙紅兵,崔文富 勝利油田勝利采油廠,山東東營(yíng)摘要以高分辨率層序地層學(xué)和儲(chǔ)層構(gòu)型理論為指導(dǎo),8 砂組河口壩砂體構(gòu)型界面進(jìn)行了層次表征.8、17個(gè)短期基準(zhǔn)面旋回.在等時(shí)地層格架內(nèi),：5級(jí)界面常發(fā)

2、育穩(wěn)定的前三角洲泥巖,;4 、粉砂質(zhì)泥巖組成,形成流體滲流屏障；3級(jí)界.利用密井網(wǎng)區(qū)的動(dòng)態(tài).構(gòu)型界面的層次表征揭示了儲(chǔ)層內(nèi)部復(fù)雜的構(gòu)型界面對(duì)剩余,為剩余油的挖潛指明了方向.關(guān)鍵詞高分辨率層序地層學(xué)；三角洲；河口壩；構(gòu)型界面；層次分析；滲流屏障； 勝坨油田 中圖分類號(hào)TE12113; TE19文獻(xiàn)標(biāo)識(shí)碼A文章編號(hào)10002975220210620219204構(gòu)型是指沉積砂體內(nèi)部由各級(jí)次沉積界面所限定的砂質(zhì)單元和不連續(xù)“薄夾層的幾 何形態(tài)、規(guī)模大小、相互排列方式與接觸關(guān)系等結(jié)構(gòu)特征.目前 ,野外露頭和現(xiàn)代沉積的 構(gòu)型研究已取得一定進(jìn)展1,但地下儲(chǔ)層的構(gòu)型研究受資料所限,仍在起步階段2,3.構(gòu)型應(yīng)用

3、于河流、風(fēng)成和深水沉積物相模型中,被認(rèn)為是一個(gè)合理成熟的方法,而三角洲沉積的構(gòu)型分析研究缺乏.沉積體的沉積界面等級(jí)概念及分級(jí)體系已廣泛應(yīng)用于儲(chǔ)層沉積學(xué)研究領(lǐng)域中,成為認(rèn)識(shí)沉積體內(nèi)部構(gòu)型的一種有效方法.利用不同規(guī)模的界面 ,可將地層分成一系列的三維沉 積單元,既有利于分類描述,也有利于研究各級(jí)沉積作用的規(guī)模和持續(xù)時(shí)間4.筆者依據(jù)構(gòu)型理論和層次分析方法,對(duì)勝二區(qū)沙二段8砂組河口壩儲(chǔ)層構(gòu)型界面進(jìn)行層次表征,建立儲(chǔ)層內(nèi)部構(gòu)型界面分布模型,為河口壩儲(chǔ)層非均質(zhì)性研究和剩余油挖潛提供方向.1高分辨率層序地層格架勝坨油田位于濟(jì)陽(yáng)坳陷東營(yíng)凹陷北部,陳家莊凸起南端,是一個(gè)逆牽引背斜構(gòu)造油田.主要斷層將勝坨油田分割

4、成勝一區(qū)、勝二區(qū)和勝三區(qū)3個(gè)區(qū),其中勝二區(qū)位于勝坨油田中部,是一個(gè)北部和東部被斷層切割、西南部與邊水相連的扇形斷塊油藏.沙二段是主力含 油層系,共分為15個(gè)砂層組.詳細(xì)的沉積環(huán)境研究說(shuō)明,沙二段時(shí)期發(fā)育河控湖相三角 洲沉積,其中沙二段8砂組砂體是典型的三角洲前緣沉積,以發(fā)育厚層的河口壩砂體為特 征.沉積微相的研究成果大量被國(guó)內(nèi)外專著引用,但儲(chǔ)層構(gòu)型的研究尚很少5.高含水開(kāi)發(fā)后期,常規(guī)的沉積微相研究已不能滿足勝二區(qū)沙二段8砂組剩余油挖潛的需要,必須精細(xì)研究?jī)?chǔ)層內(nèi)部構(gòu)型特征,揭示儲(chǔ)層內(nèi)部小尺度的非均質(zhì)性.通過(guò)大量的單井和連井剖面精細(xì)分析和比照,采用以高頻沉積旋回對(duì)應(yīng)的湖泛面為界 劃分高精度層序地層

5、單元的分析方法,在沙二段8砂組識(shí)別出3個(gè)中期基準(zhǔn)面旋回、17個(gè)短期基準(zhǔn)面旋回.中期基準(zhǔn)面旋回均為基準(zhǔn)面下降的不對(duì)稱半旋回,對(duì)應(yīng)于3個(gè)水體向上變淺的過(guò)程.短期基準(zhǔn)面旋回的劃分與井間比照充分考慮了三角洲前緣沉積的斜坡(clinoform ) 特點(diǎn),以斜坡的空間發(fā)育特點(diǎn)為參考,追蹤收稿日期2021208210基金工程中國(guó)石油化工集團(tuán)公司重大科技攻關(guān)工程(P01035).河口壩的頂面.以高分辨率層序地層學(xué)劃分結(jié)果為依據(jù),將沙二段8砂組地層細(xì)分為3個(gè)小層和17個(gè)韻律層.三角洲前緣河口壩在空間上具有向盆地前積、不同時(shí)期河口壩垂 向疊加、側(cè)向相連的特點(diǎn),所以每個(gè)韻律層的發(fā)育范圍有限,單井在每個(gè)小層平均鉆遇

6、35個(gè)韻律層不等.2構(gòu)型界面層次分析211層次界面分級(jí)巖心上構(gòu)型界面級(jí)次的識(shí)別、劃分,鍵6.為了進(jìn)一步揭示沉積體內(nèi)部沉積層次,對(duì)沙二段8劃分,從小到大共劃分出如下 5級(jí)界面(圖1)0圖1三角洲前緣河口壩砂體層次界面分級(jí)1) 1 級(jí)界面 為交錯(cuò)層系的界面,即由一系列相同紋層組成的界面,界面的方向與古水流的方向有關(guān).其特點(diǎn)是沒(méi)有明顯的侵蝕作用,側(cè)向上可被更高級(jí)次界面截蝕.在8砂組儲(chǔ)層中,主要表現(xiàn)為低角度斜層理層系界面、板狀交錯(cuò)層理層系界面、平行層理層系界 面和波狀交錯(cuò)層理層系界面等.2) 2 級(jí)界面為層系組界面,反映流動(dòng)條件或流動(dòng)方向的變化,是砂體內(nèi)部不同巖相 之間的分界面,在側(cè)向上可被更高級(jí)界面

7、削蝕.界面方向與古水流的變化有關(guān),且河口壩砂體不同部位的界面方向也不同.與 1級(jí)界面的區(qū)別是界面上下的巖相發(fā)生變化.3) 3 級(jí)界面 為單一河口壩砂體內(nèi)部增生體的頂、底界面 ,界面向湖心方向傾斜,其 上披覆著短暫間洪期沉積的薄泥質(zhì)夾層,薄泥層界面上下的巖相組合相似.此類界面反映 了河口沉積作用的短暫變化,如河水流量的變化、負(fù)載的增減或湖水的季節(jié)性漲縮等.4) 4 級(jí)界面 為多個(gè)河口壩增生體疊合形成的單一河口壩的頂界面,界面亦向湖心方向傾斜,是三角洲朵體廢棄后,水體加深的間灣沉積形成.4級(jí)界面是8砂組三角洲前緣 河口壩沉積的各韻律層分界面,界面上下的巖相明顯不同.界面橫向延伸長(zhǎng)度較大,根本覆蓋下

8、伏的單一河口壩砂體,頂部可以被更高級(jí)界面削蝕,底部常可與三級(jí)界面重合或合 并.5) 5 級(jí)界面 為多個(gè)單一河口壩垂向疊加與側(cè)向疊合形成的河口壩復(fù)合體的頂界面,是8砂組三角洲前緣沉積體中識(shí)別出來(lái)的最高級(jí)別的沉積界面,為主要的侵蝕或洪泛面.界面向湖心方向傾斜,多為平坦或略微波狀起伏,延伸范圍廣,分布穩(wěn)定,覆蓋整個(gè)研究 區(qū),由三角洲朵體的遷移或水下分流河由上述可知,5級(jí)界面限定整個(gè)研究區(qū),是主要的侵蝕或洪泛面；4級(jí)界面通常定義 單一河口壩壩體；3級(jí)界面分隔三角洲前緣河口壩層序內(nèi)部的增生體；12級(jí)界面只在巖心中可識(shí)別,常規(guī)測(cè)井資料無(wú)法識(shí)別,因此不做進(jìn)一步研究.界面的級(jí)別在空間上可能發(fā) 生側(cè)向漸變,任何

9、級(jí)別的界面都可能被同級(jí)另I或更高級(jí)別的界面削截,但不會(huì)被更低級(jí)別的界面削截.212構(gòu)型界面識(shí)別不同層次的構(gòu)型界面上下均分布著細(xì)粒的沉積,如粉砂質(zhì)泥巖、泥巖或成巖作用形成 的鈣質(zhì)砂巖,形成隔夾層,隔夾層對(duì)流體滲流及原油采收率的影響很大,是儲(chǔ)層內(nèi)部非均質(zhì)性的主要地質(zhì)因素,同時(shí)也是識(shí)別構(gòu)型界面的關(guān)鍵.根據(jù)構(gòu)型研究的層次性原那么,對(duì)應(yīng)于35級(jí)層次界面,共分為3級(jí)隔夾層.I級(jí)為 單一河口壩增生體之間的夾層,014m , 自然電位(SP )與自然伽馬(GR )曲線稍微回 返,夾層側(cè)向延伸范圍有限,局部可被后期洪水沖蝕而未保存一； n級(jí)為單,物性較 差,可對(duì)流體滲流起屏障作用,厚度012110m,曲線幅度差

10、中等；田級(jí)為河口壩復(fù)合體 之間的厚層前三角洲泥質(zhì)層,SP , ML 曲線無(wú)幅度差,延伸范圍廣,不具滲透性,是有效 的隔層.通過(guò)取心井巖電標(biāo)定,在未取心井中識(shí)別出各級(jí)次隔夾層,進(jìn)而在單井中劃分出35級(jí)構(gòu)型界面213構(gòu)型界面的開(kāi)發(fā)響應(yīng)對(duì)于沙二段8砂組而言,3級(jí)界面對(duì)于開(kāi)發(fā)后期的意義更重要,由于34級(jí)界面是層內(nèi)剩余油的主要限制因素,縱向剩余油的分布與平面剩余油的富集均與34級(jí)界面相關(guān).利用研究區(qū)密井網(wǎng)的動(dòng)態(tài)監(jiān)測(cè)資料,可揭示構(gòu)型界面的存在,分析構(gòu)型界面限制的剩余油分布.1） 重復(fù)地層測(cè)試 RFT 2021年1 月2日1X174井RFT壓力測(cè)試成果揭示了 4級(jí)界面對(duì)儲(chǔ)層的分隔性圖2） . 211410m

11、附近為一個(gè)4級(jí)構(gòu)型界圖2 1X 174井RFT測(cè)試成果圖面,分隔815與816韻律層,界面處的巖性為泥巖與粉砂質(zhì)泥巖,厚度約112m.構(gòu)型界面之下的薄層低滲透遠(yuǎn)砂壩砂體地層壓力低于界面之上的厚圖3 22188井吸水剖面成果圖層高滲透河口壩主體地層壓力,說(shuō)明此處4級(jí)構(gòu)型界面對(duì)地下流體的滲流起主要限制作用 ,將儲(chǔ)層分割為兩個(gè)獨(dú)立的流動(dòng) 單元,下部的遠(yuǎn)砂壩砂體動(dòng)用程度高于上部的河口壩主體.據(jù)此分析,河口壩主體仍有剩余油分布.2） 吸水剖面1998年7月4日22188井吸水剖面揭示3級(jí)界面影響剩余油分布圖3） . 832韻律層內(nèi)部存在一個(gè)低滲透的3級(jí)構(gòu)型界面217114m ,界面上下吸水狀況差異很大,

12、上部河口壩砂體滲透率級(jí)差小,注入水在重力作用下,易下沉至構(gòu)型界面之上； 下部河口壩砂體滲透率級(jí)差大,重力作用不明顯,注入水優(yōu)先沿頂部高滲透砂體流動(dòng),即在構(gòu)型界面之下流動(dòng),造成構(gòu)型界面上下吸水強(qiáng)度大,剩余油相對(duì)不富集.? 52?石油天然氣學(xué)報(bào)江漢石油學(xué)院學(xué)報(bào)2021年12月3構(gòu)型界面層次建模構(gòu)型界面層次建模的關(guān)鍵是井間預(yù)測(cè)問(wèn)題.沙二段砂組的密井網(wǎng)檢查井區(qū)有豐富的靜態(tài)與動(dòng)態(tài)資料,為構(gòu)型界面的井間預(yù)測(cè)和層次建模提供了保證.由于3級(jí)與45級(jí)構(gòu)型界面的分布特點(diǎn)不同,分2個(gè)層次建立構(gòu)型界面模型.先建立4級(jí)/5級(jí)構(gòu)型界面三維模型,在此模型限制下,選擇資料豐富的井組,的構(gòu)型界面展布,建立3級(jí)構(gòu)型界面的剖面模型

13、.4 級(jí)/5級(jí)構(gòu)型界面的分布范圍廣,層易于識(shí)別,圖4 81小層4級(jí)/5級(jí)界面三維空 間分布模型,采(圖4).4級(jí)/5級(jí)構(gòu)型界面卞K型反映 81小層沉積時(shí)期,砂體,同時(shí),亦向西北方向 遷移.4級(jí)構(gòu)型界面限定的砂體呈透鏡狀.根據(jù)22188井示蹤劑監(jiān)測(cè)結(jié)果推斷韻律層內(nèi)部3級(jí)構(gòu)型界面的分布,建立了示蹤劑監(jiān)測(cè)井組的3級(jí)構(gòu)型界面剖面模型(圖5).由于3級(jí)界面存在和鈣質(zhì)夾層的遮擋,22188 井注入的示蹤劑未在 32197和32199井檢測(cè)出.3級(jí)界面的延伸范圍有限,泥質(zhì) 夾層的發(fā)育不均勻,依據(jù)地下資料進(jìn)行井間預(yù)測(cè)難度很大,目前還不能在全區(qū)范圍內(nèi)建立 模型.圖5 83小層3級(jí)界面剖面分布模型4 結(jié) 論1)

14、5 級(jí)界面構(gòu)成小層間的隔層,4級(jí)界面作為滲流屏障,將單一河口壩分割成相對(duì)獨(dú) 立的流動(dòng)單元,3級(jí)界面對(duì)流體滲流具有遮擋與緩沖作用.3級(jí)與4級(jí)界面伴生的泥質(zhì)或泥質(zhì)與鈣質(zhì)夾層組合體對(duì)剩余油的分布起決定作用.2) 通過(guò)實(shí)例分析說(shuō)明,外表并不復(fù)雜的成熟油田仍具有進(jìn)一步挖潛的機(jī)遇.構(gòu)型界面分析是識(shí)別儲(chǔ)層非均質(zhì)性的有效方法.參考文獻(xiàn)1 王振奇,何貞銘,張昌民等1三角洲前緣露頭儲(chǔ)層層次分析以鄂爾多斯盆地東緣潭家河剖面為例J1江漢石油學(xué)院學(xué)報(bào),2021, 26(3) :323512 李陽(yáng)1我國(guó)油藏開(kāi)發(fā)地質(zhì)研究進(jìn)展J1石油學(xué)報(bào),2021, 28(3) :757913 劉自亮1辮狀河三角洲前緣厚層儲(chǔ)集砂體沉積學(xué)研究

15、D 1蘭州：中國(guó)科學(xué)院研究生院(蘭州地質(zhì)研究所),202114 王俊玲,任紀(jì)舜1嫩江現(xiàn)代河流沉積體巖相及內(nèi)部構(gòu)形要素分析J1地質(zhì)科學(xué),2001,36:38539415 何文祥,吳勝和,唐義疆等1河口壩砂體構(gòu)型精細(xì)解剖J1石油勘探與開(kāi)發(fā),2021, 32(5) :424616 馬世忠,王一博,崔義等1油氣區(qū)水下分流河道內(nèi)部建筑結(jié)構(gòu)模式的建立J1大慶石油學(xué)院學(xué)報(bào),2021, 30(5) :131According to t he analysis above , it is concluded t hat t here are t hree areas for secondary oil expl

16、ora 2tion , it is very hopef ul to find some geological reserves and it is of great significance for imp roving oilfield p roduction outp ut and reserves 1K ey w ords :Biyang Dep ression ; nort hern slope ; oil and gas ; enrichment rules ; secondary exploration 33V olcanic Logging R ecognition in R

17、eservoir AnalysisY ANG Shen 2gu (Faculty of Resources , China University of Geosciences , W uhan 430074, Hubei , China; College of Geosciences , Yangtze University , J ingz hou 434023, Hubei , China )LI U X iao 2cui(N o 12Oil Production Plant , Zhongy uan Oil f iel d Company , S I N O P EC, Puy ang

18、457532, Henan, China )(H U Zhi 2hua College of Geosciences , Yangtze University , J ingz hou 434023, H ubei , China )FAN Zhen , X U Jiang 2tao , CAO Zuo(X inj iang Oil f iel d Com pany ,CN PC, Karam ay 834000, X inj iang , China Abstract :In t he process of volcanic oil and gas , objective rea 2sons

19、 , t here existed insufficient lit hologic , which con 2st rained t heir exploration and develop ment 1On t of volcanic rocks was simplified for reservoir analysis , of simplified volcanic types used in co nventional logging It t hat t he types of conventional logging curves wit h better , DEN , R T

20、 (RXO , RS , COND ) , GR and CAL 1Generally t presented high gamma ray , while volcanic clastic rocks and lava p , high density and low interval t ransit time 1In lava zones , logging curve p lava break , it reflected high interval transit time and low density and low 1By integrating data from oilfi

21、elds , chart board and criterion areestablished for logging recognition 1The analytical met hod , idea and chart board are of great significance for t he basic st udy of volcanic reservoirs 1K ey w ords :volcanic rock ; oil and gas pool ; reservoir ; lit hologic recognition ; logging data38Character

22、istics of J 2q Source R ocks in K uqa DepressionLI Qian (Faculty of Energy Resources , China Universit y of Geosciences , B ei j ing 100083, China )WANG Fei 2yu (Faculty of Resources and I nf ormation , China Universit y of Pet roleum , B ei j ing 102249, China )K ONG Fan 2zhi (Research I nstitute o

23、f Pet roleum Ex ploration and Development , CN PC, B ei j ing 100083, China )XI AO Zhong 2yao (Tarim Oil f iel d Com pany , Pet roChina, Tarim 841000, X inj iang , China )CHE N Kai 2yuan (Faculty of Energy Resources , China University of Geosciences , B ei j ing 100083, China )Abstract :Many newly f

24、ound oils in Kuqa Dep ression were from J 2q source rocks , but t hey were not clearly recognized , especially t he type of organic matter was not well known 1A pyrolysis data base of Kuqa Basin was established to st udy t he characteristics of J 2q source rocks , J 2q lake facies source rocks were

25、mainly developed from t he lower st rata , it was more developed in t he west t han t hat in t he nort h 1Organic abundance was higher and it s hydrocarbon genetic potential was t he highest among t he source rocks 1Type of organic matter was III kerogen , which was t he bestamong t he source rocks

26、1Organic mat urity in t he west is higher t han t hat in t he nort h , it is at mat ure stage 1J 2q Forma 2tion is t he mo st important source rock in Kuqa Dep ressionK ey w ords :Kuqa Depression ; J 2q Formatio n ; organic abundance ; organic mat urity ; organic matter type43Characteristics of H ea

27、vy Mineral Source Analysis in the 1st Member of T aizhou Formation in Subei B asinX U T ian 2wu , WANG Y ing 2min , ZE NG Jian 2hui(MO E Key L aboratoryof Oil and Gas A ccumulation Mechanism ; B asin and Reservoi r Research Center in China University of Pet roleum , B ei j ing 102249, China )LI N Sh

28、u 2long (S huguang Oil Production Pl ant , L iaohe Oil f iel d Com pany , CN PC, Panj in 124109, L iaoning , China )WANG Wen 2jun (Geoscience I nstitute of J iangsu Oil f iel d Com pany , S I N O P EC, Yangz hou 225000, J iangsu , China )Abstract :There were some debates on t he directions of paleoc

29、urrent and sources in t he 1st member of Taizhou Formation of Subei Basin , t he characters of heavy minerals were analyzed by correlation a 2nalysis and R factor analysis , modes of 3different mineral compositions were identified and corre 2sponding parent rock types were also determined 1In combin

30、ation wit h t he characteristics of conglom 2erate t hickness , and ratio of it s t hickness and formation t hickness f rom more t han 70wells , it is pointed out t hat t he major deposit s in t he 1st member of Taizhou Formation are f rom L usu uplift in west and Tongyang uplift in t he sout h of t

31、 he basin , t he second source is f rom Jianhu uplift , it is also pointed out t hat t he source f rom L usu uplift has t he biggest affect on Subei Basin 1K ey w ords :Subei Basin ; Taizhou Formation ; heavy mineral ; conglomerate ; source area49Hierarchical Boundary Characterization of Delta Front

32、 Mouth B ar R eservoir ArchitectureLI Y un 2hai , WU Sheng 2he , LI Y an 2ping(Faculty of Resources and Inf orm ation , China University of Pet roleum , B ei j ing 102249, China ) CHE NG Hui 2ming , XI N Zhi 2guo (Geological S cienti f ic Research I nstitute of S hengli Oil f iel d , S I N O P EC, D

33、ongy ing 257015, S handong , China )ZH AO H ong 2bing , CUI Wen 2fu(S hengli Oil Production Pl ant of Shengli Oil f iel d , S I N O P EC, Dongy ing 257051, S handong , China )Abstract :Based on high sequence st ratigrap hy and reservoir struct ural t heory , boundary of delta front mout h bar reserv

34、oir architect ure was hierarchically characterized 1The 8th sand group of second mem 2ber of Shahejie Formation in Block 2of Shengt uo Oilfield was subdivided into 3middle 2term base lev 2els and 17short 2term base levels by using high f requency lake overflow surfaces 1Wit hin t he isochrone st rat

35、igrap hic f ramework ,five level architect ural boundary systems of lacust rine mout h bar reservoir were established , which was crucial to oilfield develop ment at high water 2cut stage 1Five and four lev 2el bounding surfaces often acted as fluid 2flow barriers , while t hree level bounding surfa

36、ce was com 2posed of low permeability and t hick silt rocks 1The 35level architect ural dist ributionpat 2terns were modeled by using t he data f rom infill well pattern area 1of mout h bar reservoir indicates internal boundary cont rols on t he oil after waterflooding , which provides guideline for

37、 tapping t of K ey w ords :mout h bar ; architect ure ; boundary ; analysis ; fluid flow barrier ;Shengt uo Oilfield62G enesis and Identif P in Fresh 2w ater R eservoirsCHE NG X iang 2zhi (I in China University of Pet roleum , Dongy ing 257061, S handong , China )ZHOU Can 2Pet Ex ploration and Devel

38、opment , Pet roChina, B ei j ing 100083, China )FAN Y i 2ren of Geo 2and I nf orm ation in China Universit y of Pet roleum , Dongy ing 257061, S handong , China )WANG Zhao 2(X Oil Production Plant , S hengli Oil f iel d , S I N O P EC, Dongy ing 257068, S handong , China )H UANG Shu 2xian (Research

39、I nstitute of Pet roleum Ex ploration and Development , Pet roChina, B ei j ing 100083, China )Abstract :The genesis of low 2co nt rast pay zones was complex and various , t he low 2cont rast pay zones in f resh 2water reservoirs were divided into five categories 1Cro ss 2plot , new log technology ,

40、 t raditio n 2al log data were effectively analyzed for recognizing t he different low 2cont rast pay zones , low 2cont rast pay zones were quantitatively evaluated by reaso nably selecting t he shaly sand sat uration model 1The integral qualitative recognition and quantitative interp retatio n in t

41、 he evaluation of low 2cont rast pay 2zones achieve a good effect in application , t he idea of low 2co nt rast pay zone evaluation in fresh 2water reservoir is established , it provides an economical , practical and reliable technique for evaluating low 2cont rast pay zones 1K ey w ords :f resh 2wa

42、ter reservoir ; low cont rast pay zone ; genetic classification ; spontaneous poten 2tial ; new logging technique ; pay zone identification66Characteristics and Interpretation of G as Logging Data in Subei B asinXI AO Qiu 2sheng (Ex ploration Department of J iangsu Oil f iel d Com pany , S I N O P E

43、C, Yangz hou 225009, J iangsu , China )Abstract :Based on statistical analysis result s of gas logging data from past 30years in Subei Basin , t he basic characteristics of gas logging in different reservoirs and t he evaluation criteria for oil , gas and water layers were analyzed based on abnormal

44、 gas logging in different target zones of main pet ro 2liferous areas , such as Gaoyou Sag and Jinhu Sag of Subei Basin 1The result s show t hat gas logging is only related to fluid properties , not to lit hlogical feat ures of t he reservoirs 1For t he reservoirs wit h high and low resistivities ,

45、gas logging is a very important met hod for discovering and evaluating oil and gas layers and can effectively guide t he oil and gas exploration and develop ment 1Therefore , gas logging can compensate for ot her kind of logging 1K ey w ords :gas logging ; whole hydrocarbon ; met hane ; rising times ; Subei Basin